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1. 发明授权

US5199031A Method and system for uniquely identifying control channel time slots 失效
标题翻译：用于独特识别控制通道时间段的方法和系统
公开(公告)号：US5199031A
公开(公告)日：1993-03-30
申请号：US662414
申请日：1991-02-28
申请人： Jan E. .ANG. S. Dahlin
发明人： Jan E. .ANG. S. Dahlin
IPC分类号： H04B7/26 , H04J3/06 , H04L7/04 , H04W36/00
CPC分类号： H04B7/2643 , H04L7/041 , H04W28/06
摘要： A method and system in which the control channels of an associated base station directly correspond to certain time slots of a radio channel frame, which also includes time slots being utilized for traffic channels. The time slots being utilized as control channels are marked with uniquely defined control channel indicators which include unique Sync Words and unique control channel identification words. The mobile station recognizes the uniquely defined control channel indicators and identifies those particular time slots as control channels so as to distinguish from the time slots which are not being used as control channels.
摘要翻译：一种方法和系统，其中相关基站的控制信道直接对应于无线电信道帧的某些时隙，其还包括用于业务信道的时隙。用作控制信道的时隙用唯一定义的控制信道指示标记，其包括唯一的同步字和唯一的控制信道识别字。移动台识别唯一定义的控制信道指示符，并且将那些特定的时隙识别为控制信道，以区分不被用作控制信道的时隙。

2. 发明授权

US5293423A Synchronizing method in a mobile radio system 失效
标题翻译：移动无线电系统中的同步方法
公开(公告)号：US5293423A
公开(公告)日：1994-03-08
申请号：US987244
申请日：1992-12-07
申请人： Jan E. .ANG.. S. Dahlin , Walter Ghisler , Bengt Y. Persson
发明人： Jan E. .ANG.. S. Dahlin , Walter Ghisler , Bengt Y. Persson
IPC分类号： H04B7/26 , H04K1/00 , H04L9/12 , H04W12/00
CPC分类号： H04W12/02 , H04K1/00 , H04L9/0891 , H04L9/12 , H04L2209/80
摘要： A synchronizing method in a mobile radio system which operates with Time Division Multiple Access (TDMA) but which lacks global time reference for all base stations and mobiles in the system. The inventive method is intended for ciphered transmission of data and speech in accordance with a given ciphering key (E2). When handing-over a call, the ciphering synchronism is lost. In accordance with the method, subsequent to hand-off (the time t.sub.2), the take-over base station (BS2) signals non-ciphered information (S1) to the mobile (MS) disclosing the number of frames (R1-R13) which shall pass until ciphering can again be commenced, calculated from a given frame (R1). Call information is transmit the following frame (R2), this information now being ciphered with the aid of a ciphering key (E1) different to the original key. This other ciphering key consists of a periodic bit sequence having a period which is equal to one frame interval.
摘要翻译：移动无线电系统中的同步方法，其使用时分多址（TDMA）操作，但是对于系统中的所有基站和移动台缺少全局时间参考。本发明的方法旨在根据给定的加密密钥（E2）进行数据和语音的加密传输。移交电话时，加密同步丢失。根据该方法，在切换（时间t2）之后，接收基站（BS2）向公布帧数（R1-R13）的移动台（MS）发送未加密信息（S1）它将通过，直到从给定的帧（R1）计算出加密可以再次开始。呼叫信息发送下一帧（R2），该信息现在通过与原始密钥不同的加密密钥（E1）进行加密。这个其他加密密钥由具有等于一个帧间隔的周期的周期性比特序列组成。

3. 发明授权

US5559886A Method of carrying out an authentication check between a base station and a mobile station in a mobile radio system 失效
标题翻译：在移动无线电系统中进行基站与移动台之间的认证检查的方法
公开(公告)号：US5559886A
公开(公告)日：1996-09-24
申请号：US298782
申请日：1994-08-31
申请人： Paul W. Dent , Alex K. Raith , Jan E. .ANG.. S. Dahlin
发明人： Paul W. Dent , Alex K. Raith , Jan E. .ANG.. S. Dahlin
IPC分类号： H04W12/06 , H04L9/00 , H04L9/32
CPC分类号： H04W12/06 , H04W12/12
摘要： Methods for carrying out an authentication check in a mobile telephone system in which an authentic base station serves a plurality of mobile stations. A prior method carried out a unidirectional check from the base to a calling mobile, permitting a false base to carry out a false authentication check by collecting a number of so-called RAND-Response pairs. To avoid this problem, another unidirectional, base-to-mobile, authentication check and an authentication check from the mobile to the base are carded out. In one embodiment, only the bi-directional authentication check is carried out.
摘要翻译：在真实基站服务于多个移动台的移动电话系统中执行认证检查的方法。先前的方法执行从基地到呼叫移动台的单向检查，允许假基地通过收集许多所谓的RAND-响应对来执行虚假认证检查。为了避免这个问题，从移动到基地的另一个单向，基站到移动的认证检查和认证检查被梳理出来。在一个实施例中，仅执行双向认证检查。

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